XML 55 R43.htm IDEA: XBRL DOCUMENT
v3.23.3

Investments in Nuclear Decommissioning Trusts and Other Special Use Funds (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Schedule of Fair Value of APS's Nuclear Decommissioning Trust Fund Assets | The following tables present the unrealized gains and losses based on the original cost of the investment and summarizes the fair value of APS’s nuclear decommissioning trusts and other special use fund assets (dollars in thousands):
| September 30, 2023
| Fair Value |  | Total Unrealized Gains |  | Total Unrealized Losses
Investment Type: | Nuclear Decommissioning Trusts |  | Other Special Use Funds |  | Total |  |
Equity securities | $ | 444,063 |  |  | $ | 55,253 |  |  | $ | 499,316 |  |  | $ | 327,887 |  |  | $ | (23) |
Available for sale-fixed income securities | 693,510 |  |  | 311,624 |  |  | 1,005,134 |  | (a) | 623 |  |  | (74,383) |
Other | (17,110) |  |  | 1,282 |  |  | (15,828) |  | (b) | — |  |  | — |
Total | $ | 1,120,463 |  |  | $ | 368,159 |  |  | $ | 1,488,622 |  |  | $ | 328,510 |  |  | $ | (74,406) |
(a)As of September 30, 2023, the amortized cost basis of these available-for-sale investments is $1,079 million. (b)Represents net pending securities sales and purchases.
| December 31, 2022
| Fair Value |  | Total Unrealized Gains |  | Total Unrealized Losses
Investment Type: | Nuclear Decommissioning Trusts |  | Other Special Use Funds |  | Total |  |
Equity securities | $ | 487,240 |  |  | $ | 66,974 |  |  | $ | 554,214 |  |  | $ | 334,817 |  |  | $ | (267) |
Available for sale-fixed income securities | 582,343 |  |  | 279,294 |  |  | 861,637 |  | (a) | 3,177 |  |  | (68,795) |
Other | 3,827 |  |  | 963 |  |  | 4,790 |  | (b) | — |  |  | (29) |
Total | $ | 1,073,410 |  |  | $ | 347,231 |  |  | $ | 1,420,641 |  |  | $ | 337,994 |  |  | $ | (69,091) |
(a)As of December 31, 2022, the amortized cost basis of these available-for-sale investments is $927 million. (b)Represents net pending securities sales and purchases.
Schedule of Realized Gains and Losses and Proceeds from the Sale of Securities by the Nuclear Decommissioning Trust Funds | The following table sets forth APS’s realized gains and losses relating to the sale and maturity of available-for-sale debt securities and equity securities, and the proceeds from the sale and maturity of these investment securities (dollars in thousands):
| Three Months Ended September 30,
| Nuclear Decommissioning Trusts |  | Other Special Use Funds |  | Total
2023 |  |  |  |  |
Realized gains | $ | 34,897 |  |  | $ | — |  |  | $ | 34,897 |
Realized losses | (11,568) |  |  | (547) |  |  | (12,115) |
Proceeds from the sale of securities (a) | 487,324 |  |  | 90,816 |  |  | 578,140 |
2022 |  |  |  |  |
Realized gains | $ | 788 |  |  | $ | — |  |  | $ | 788 |
Realized losses | (6,908) |  |  | — |  |  | (6,908) |
Proceeds from the sale of securities (a) | 153,573 |  |  | 65,244 |  |  | 218,817 |
(a) Proceeds are reinvested in the nuclear decommissioning trusts and other special use funds, excluding amounts reimbursed to the Company for active union employee medical claims from the active union employee medical account.
| Nine Months Ended September 30,
| Nuclear Decommissioning Trusts |  | Other Special Use Funds |  | Total
2023 |  |  |  |  |
Realized gains | $ | 71,338 |  |  | $ | — |  |  | $ | 71,338 |
Realized losses | (28,454) |  |  | (547) |  |  | (29,001) |
Proceeds from the sale of securities (a) | 922,270 |  |  | 223,398 |  |  | 1,145,668 |
2022 |  |  |  |  |
Realized gains | $ | 8,093 |  |  | $ | — |  |  | $ | 8,093 |
Realized losses | (26,582) |  |  | — |  |  | (26,582) |
Proceeds from the sale of securities (a) | 783,232 |  |  | 127,255 |  |  | 910,487 |
(a) Proceeds are reinvested in the nuclear decommissioning trusts and other special use funds, excluding amounts reimbursed to the Company for active union employee medical claims from the active union employee medical account.
Schedule of Fair Value of Fixed Income Securities, Summarized by Contractual Maturities | The fair value of APS’s fixed income securities, summarized by contractual maturities, at September 30, 2023, is as follows (dollars in thousands):
| Nuclear Decommissioning Trusts |  | Coal Reclamation Escrow Account |  | Active Union Employee Medical Account |  | Total
Less than one year | $ | 18,012 |  |  | $ | 59,191 |  |  | $ | 18,891 |  |  | $ | 96,094 |
1 year – 5 years | 194,625 |  |  | 42,158 |  |  | 184,682 |  |  | 421,465 |
5 years – 10 years | 163,662 |  |  | — |  |  | 2,788 |  |  | 166,450 |
Greater than 10 years | 317,211 |  |  | 3,914 |  |  | — |  |  | 321,125 |
Total | $ | 693,510 |  |  | $ | 105,263 |  |  | $ | 206,361 |  |  | $ | 1,005,134 |

X
- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-2 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-3 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InvestmentsDebtAndEquitySecuritiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-9 + Details
Name: | us-gaap_ScheduleOfRealizedGainLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration